MOTOR DRIVING CIRCUIT, FAN MOTOR, ELECTRONIC DEVICE, AND NOTEBOOK PERSONAL COMPUTER

摘要

A motor driving circuit includes a pulse generation circuit for generating pulse signals in which a duty ratio of one of logic levels increases as driving voltage in response to target rotation speed of a motor increases, and a drive control circuit for driving the motor by the driving voltage with a duty ratio higher than that of the pulse signal when the motor starts rotating from a halt based on a rotation signal according to rotation of the motor and driving the motor by the driving voltage for a period when the pulse signal remains at one of the logic levels after the motor starts to rotate.